A common usage of ISO images (e.g. Fedora-14-x86_64-netinst.iso) is to put them on a USB stick instead of burning them optical media. This works on most BIOSes. It's much easier than dealing with optical media. Unfortunately, the Linux kernel thinks that the USB stick is partitioned so booting the USB stick fails when trying to mount rootfs. This is because of the first 512 bytes in the ISO image looks exactly like a MS-DOS partition table. It would be good to create the ISO image in a way so this doesn't happen.
I'm a pretty dumb user of mkisofs, so I'm not sure what options one could use. Couple things though. 1) netinst.iso is actually built by anaconda, as part of "buildinstall" 2) livecd-iso-to-disk mostly works with these isos if you fiddle with it right. 3) Recently we've started using hybridiso for some of the isos (not sure if netinst.iso is one of them) which lets you dd the iso and put it on a usb device and boot it. Have you tried anything other than netinst?
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